Bomb Calorimeter

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elizabethrojas1G
Posts: 44
Joined: Fri Sep 25, 2015 3:00 am

Bomb Calorimeter

Postby elizabethrojas1G » Wed Jan 13, 2016 6:39 pm

A bomb calorimeter in which benzene is burned is an isolated system, why? Also, can you explain the different types of calorimeters there are (constant pressure, constant volume) and how they work? Thanks!

Ashley Ramos2C
Posts: 8
Joined: Fri Sep 25, 2015 3:00 am

Re: Bomb Calorimeter

Postby Ashley Ramos2C » Wed Jan 13, 2016 9:23 pm

An isolated system is a thermodynamic system that cannot exchange either energy or matter outside the boundaries of the system. This simply means that the system is sealed so that mass cannot leave or enter the system and insulated so that the system is not heated or cooled by the surrounding environment. Calorimetry is a method to measure the heat effect of a process, or chemical change. For Constant Pressure an example can be when one uses Styrofoam cups with insulated lid to prevent the heat lose and have a thermometer to measure the temperature changing. It works at atmosphere pressure, which is assumed as a constant. Since the enthalpy changing is equal to heat transfer at constant pressure, this calorimeter can be used easily to measure the enthalpy change of some simple processes, like fusion enthalpy, dissolving enthalpy, and determine the heat capacity of material, such as metals. At constant volume one would need an isolated system like the bomb calorimeter. The temperature changing of the water is used to calculate the heat of reaction

Hope this helps

elizabethrojas1G
Posts: 44
Joined: Fri Sep 25, 2015 3:00 am

Re: Bomb Calorimeter

Postby elizabethrojas1G » Sun Jan 17, 2016 7:06 pm

Thank you!


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